Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...360..702f&link_type=abstract
Astronomy and Astrophysics, Vol. 360, p.702-706
Astronomy and Astrophysics
Astrophysics
13
Line: Profiles, Radiation Mechanisms: Non- Thermal-Sun: Flares
Scientific paper
Hα, Lyα, Lyβ, CaII K and λ8542 Å line profiles have been computed for limb flares with height distributions of temperatures as given by the semi- empirical models F1 and F2, by including the non-thermal collisional excitation and ionization of hydrogen and of ionized calcium that results from electron bombardment. In agreement with observations, the computed profiles of the hydrogen lines are very broad, especially at the height where the source function reaches its maximum. Non-thermal effects are less pronounced for CaII lines.
Ding Ming-De Ding
Fang Chen
Hénoux Jean-Claude
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